heptapeptide is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-03-22. Numbers and descriptions here follow the published literature rather than marketing material.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
Pharmacological accounts link semax to melanocortin signalling and to modulation of neurotrophic factor expression, particularly brain-derived neurotrophic factor and nerve growth factor. Much of this evidence comes from rodent studies using intranasal delivery, a route chosen because it allows peptides to reach the central nervous system with limited systemic exposure. Whether the same mechanisms operate in humans at comparable magnitude remains an open question. The precise receptor or receptors responsible for the reported behavioural and neuroprotective effects have not been conclusively identified.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analogue of the ACTH(4-10) fragment |
| Amino acid sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Single-letter form MEHFPGP |
| Molecular formula | C37H51N9O10S | Free peptide, nominal mass near 814 Da |
| First registration | 1994, Russia | Nasal formulation for neurological indications |
| Typical purity grade | 95% or higher by HPLC | Research material; higher grades used as reference standards |
The compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
Second Cup Coffee Co. is a Canadian specialty coffee retailer operating more than 345 cafes across the country. Its headquarters are in Mississauga, Ontario. Its stores sell hot and cold beverages, pastries, snacks, pre-packaged food items, hot and cold sandwiches, and drinkware, including mugs and tumblers. Second Cup sales continue to compete with Starbucks, Tim Hortons and McDonald's, which also feature espresso-based specialty drinks. Since its inception, Second Cup has expanded its franchises to the United States, Morocco, Saudi Arabia, Bahrain, Kuwait, Oman, Qatar, Lebanon, Jordan, Egypt, the United Arab Emirates, Iraq, Syria, Yemen, Cyprus, Azerbaijan, Angola, Lithuania, and Romania. It also opened a store in Pakistan in 2013, in the United Kingdom in 2014, in the Philippines in 2015, and in Poland in 2016.
Subject to its constitutional principles and the basic concepts of its legal system, each Party shall adopt such measures as may be necessary to establish as a criminal offence under its domestic law, when committed intentionally, the possession, purchase or cultivation of narcotic drugs or psychotropic substances for personal consumption contrary to the provisions of the 1961 Convention, the 1961 Convention as amended or the 1971 Convention. Previous drug control treaties had targeted drug manufacturers and traffickers, rather than users. In their 2003 article, "The Mechanics and Dynamics of the UN System for International Drug Control," David Bewley-Taylor and Cindy Fazey explain that "[t]he 1988 Convention was an attempt to reach a political balance between consumer and producer countries. Consequently, it was not only the duty of producing countries (e.g. the developing countries of Asia and South America) to suppress illicit supply, but also the duty of consumer countries (e.g.
=== Intravenous === The intravenous dosage form of eflornithine is sold under the brand name Ornidyl. Most side effects related to systemic use through injection are transient and reversible by discontinuing the drug or decreasing the dose. Hematologic abnormalities occur frequently, ranging from 10 to 55%. These abnormalities are dose-related and are usually reversible. Thrombocytopenia is thought to be due to a production defect rather than to peripheral destruction. Seizures were seen in approximately 8% of patients, but may be related to the disease state rather than the drug. Reversible hearing loss has occurred in 30–70% of patients receiving long-term therapy (more than 4–8 weeks of therapy or a total dose of >300 grams); high-frequency hearing is lost first, followed by middle- and low-frequency hearing. Because treatment for African trypanosomiasis is short-term, patients are unlikely to experience hearing loss.
The tavern serves steak, lamb, venison, duck, and rabbit. In 1956, Cold Spring Tavern was the first restaurant to serve Steve Henson's original salad dressing. Henson and his wife had recently moved to a nearby guest ranch they renamed “Hidden Valley Ranch”, and decided to try marketing the dressing in the area when it became popular with guests. Audrey Ovington, a friend of the Hensons who owned the tavern at the time, was their first commercial customer, and the condiment has since been known as ranch dressing.
== Other uses == Maxim, New Jersey, an unincorporated community in Monmouth County, New Jersey, United States Maxim (philosophy), a principle that an individual uses in making a decision Maxim (coffee), the first American brand of freeze-dried coffee, made by General Foods Maxim gun, the first self-acting machine gun Maxim Cup, South Korean Go competition Maxim DL, software package created by Cyanogen Imaging Maxim Wien, brothel in Vienna, Austria Legal maxim, certain guiding principles of law and jurisprudence Pragmatic maxim, maxim of logic formulated by Charles Sanders Peirce SilencerCo Maxim 50, a muzzle-loading rifle that includes an integrated sound suppressor
Sources: en.wikipedia.org
Because of the extraordinary coupling efficiency of HATU, it has often been used for intramolecular amidation (coupling of a carboxylic acid and an amine of the same molecule). For example, the formation of cyclo-tetrapeptides through the head-to-tail reaction of linear tetrapeptides assisted by HATU has been reported.
=== Microbiological uses === Quantitative PCR is also used by microbiologists working in the fields of food safety, food spoilage and fermentation and for the microbial risk assessment of water quality (drinking and recreational waters) and in public health protection. qPCR may also be used to amplify taxonomic or functional markers of genes in DNA taken from environmental samples. Markers are represented by genetic fragments of DNA or complementary DNA. By amplifying a certain genetic element, one can quantify the amount of the element in the sample prior to amplification. Using taxonomic markers (ribosomal genes) and qPCR can help determine the amount of microorganisms in a sample, and can identify different families, genera, or species based on the specificity of the marker. Using functional markers (protein-coding genes) can show gene expression within a community, which may reveal information about the environment.
Harry Emerson. For services to the community in Stockton-on-Tees, Cleveland. Elizabeth Margaret Evans. For services to the community, particularly Disabled People, in Llanelli, Dyfed. Shirley Everett, Newsvendor. For services to the community in Westminster, London. Doris Mabel Eves. For services to the Citizens' Advice Bureau in Farnborough, Hampshire. George Fitton Exley, Honorary Secretary, Scarborough Lifeboat Station. For services to the Royal National Lifeboat Institution. Ellen Branker Farmer, President, Old Paisley Society. For services to Conservation. Margaret Winifred Farmer. For services to the Royal British Legion in Sevenoaks, Kent. Eric Arnold Faux. For services to disabled people in Birmingham Valerie Ann Fea, lately Executive Secretary, the School Library Association. For services to Librananship and to Young People. Heather Duncan Findlay, Local Officer 2, the Benefits Agency, Department of Social Security. Nina Mary Fineron, lately Typist, Department of Social Security. Isabel H. Finlay, lately Chiropodist, Glasgow. For services to Health Care. Millar Henry Finlay, Divisional Officer, (Special Constabulary), Flintshire Division, North Wales Police. For services to the Police. Olwen Finlay. For services to Physiotherapy. Evelyn May Fisher. For services to Netball in Coventry. Myra Caroline Fisher. For services to the community in Paulsgrove, Portsmouth, Hampshire. Bernard Joseph Fitzsimmons. For public service. Michael Robert Flegg, Catering Manager, Nottingham City Hospital. For services to Health Care. Iris Mary Fletcher.
=== Menstrual disturbances === Spironolactone at higher doses can cause menstrual irregularities as a side effect in women, including metrorrhagia (intermenstrual bleeding), amenorrhea (absence of menstruation), and breakthrough bleeding. They are common during spironolactone therapy, with 10 to 50% of women experiencing them at moderate doses and almost all experiencing them at a high doses. For example, about 20% of women experienced menstrual irregularities with 50 to 100 mg/day spironolactone, whereas about 70% experienced menstrual irregularities at 200 mg/day. Most women taking moderate doses of spironolactone develop amenorrhea, and normal menstruation usually returns within two months of discontinuation. Spironolactone produces an irregular and anovulatory pattern of menstrual cycles. It is also associated with metrorrhagia and menorrhagia (heavy menstrual bleeding) in large percentages of women, as well as with polymenorrhea (short menstrual cycles). The medication reportedly has no birth control effect. The weak progestogenic activity of spironolactone has been suggested to be responsible for these effects, although not established, and spironolactone has been shown to possess insignificant progestogenic and antiprogestogenic activity even at high dosages in women. An alternative proposed cause is inhibition of 17α-hydroxylase and hence sex steroid metabolism by spironolactone and consequent changes in sex hormone levels. Indeed, CYP17A1 genotype is associated with polymenorrhea.
Sources: en.wikipedia.org
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.
No. The peptide is synthetic, although it is modelled on a fragment of a naturally occurring hormone. ACTH(4-10) is generated when ACTH is cleaved, but the Pro-Gly-Pro extension is not a known endogenous sequence. It is therefore a designed analogue rather than a natural metabolite.
The label reflects reported effects on attention, memory and recovery after neurological injury in regional clinical reports. Those reports are mostly small and have not been widely replicated outside the region. The classification is descriptive and does not imply a single defined mechanism.
It is described as a synthetic analogue of the ACTH(4–10) fragment, a short segment of adrenocorticotropic hormone. Its sequence differs from that fragment and includes two proline residues, which influence stability and behaviour in solution.